What you've asked is kind of like asking which one kind of ice cream everyone prefers. So much depends on your purpose in building and what you will use them for. If your purpose is to mainly save money, do yourself a favor and buy a nice set ready made. I'm far from an expert, but after 6 months of tinkering with these things, I've spent enough money to have bought about 3 sets of nice CIEM's from one of the custom manufacturers. However, if your purpose is to learn and tinker, then I'd recommend you start with one of the well documented combos (in this thread) based on one of the first two options you listed. I found that if you stick to the recipes, they will sound pleasing enough, and give you a good reference point for your next build. Better yet, start with a pre-made GK or HE to make it easy. Although I'm making progress, I will say that most of my early recipe tweaking with various passive components and dampers did not make things better....;>) . Regarding the Belsing drivers, I've built a CI/ED set using the Belsing branded versions of the drivers and I was happy with the result. However, you mention that you're in China. From what I can see, you should have easy access to whatever drivers you want, including Knowles and Sonion.